Atomic Beam
Mostrando 1-12 de 67 artigos, teses e dissertações.
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1. Study of PtPd Bimetallic Nanoparticles for Fuel Cell Applications
Bimetallic nanoparticles are of special interest for their potential applications for fuel cells, mainly for portable power applications. Among the bimetallic systems, Pt-Pd bimetallic nanoparticles have received great interest as they can be widely used as effective catalysts for various electrochemical reactions. In this work, Pt-Pd alloy bimetallic nanopa
Mat. Res.. Publicado em: 15/05/2017
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2. Biological X-ray irradiator characterization for use with small animals and cells
This study presents the characterization of an X-ray irradiator through dosimetric tests, which confirms the actual dose rate that small animals and cells will be exposed to during radiobiological experiments. We evaluated the linearity, consistency, repeatability, and dose distribution in the positions in which the animals or cells are placed during irradia
Braz J Med Biol Res. Publicado em: 02/03/2017
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3. Effect of Low Temperature Nitriding of 100Cr6 Substrates on TiN Coatings Deposited by IBAD
In this paper we studied the influence of pre-treating the surface of 100Cr6 steel by ion beam nitriding at low temperature (380°C) on the surface topography and wear resistance of thin TiN coatings deposited by reactive ion beam assisted deposition. The specimens were characterized by grazing incidence X-ray diffraction, scanning electron microscopy and at
Mat. Res.. Publicado em: 2015-02
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4. Nonlinear mathematical modeling of vibrating motion of nanomechanical cantilever active probe
Nonlinear vibration response of nanomechanical cantilever (NMC) active probes in atomic force microscope (AFM) application has been studied in the amplitude mode. Piezoelectric layer is placed piecewise and as an actuator on NMC. Continuous beam model has been chosen for analysis with regard to the geometric discontinuities of piezoelectric layer attachment
Lat. Am. j. solids struct.. Publicado em: 2014-05
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5. Caracterización de nanoestructuras sub-superficiales utilizando espectroscopía de aniquilación de positrones
Positron annihilation spectroscopy (PAS) has proved to be a powerful tool for the study of defects in solids due to its high sensitivity to the presence of defects such as vacancies, vacancy agglomerates or voids. Furthermore, PAS allows to identify and characterize each of these defects. There are different experimental variations of PAS technique such as p
Matéria (Rio J.). Publicado em: 2013-12
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6. Efeito de interface nas propriedades ópticas de pontos quânticos de InP/GaAs / Interface effect on the optical properties of InP/GaAs quantum dots
We studied the effect of different interface conditions on the optical properties of InP/GaAs self-assembled quantum dots grown by chemical beam epitaxy in the Stranskii-Krastanov mode. InP/GaAs quantum dots is expected to present type II band alignment, and only electrons are confined, whereas the holes are localized in the GaAs layers around the quantum do
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/08/2012
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7. Generation of an Atomic Beam by Using Laser Ablation for Isotope Separation Purposes
Abstract: Atomic vapor laser isotope separation has been studied at the Institute for Advanced Studies for nuclear purposes since 1982, and recently it has been questioned about its potentialities for the aerospace area. Many applications from nuclear propulsion to electricity generation and space navigation have been found, which justify the study of isotop
J. Aerosp. Technol. Manag.. Publicado em: 2012-12
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8. Estudo experimental da refração não linear em vapor de césio utilizando a técnica z-scan
The z-scan technique consists in measurement of the variation of the radial intensity of a Gaussian laser beam induced by self-focusing or self-defocusing while propagating through a nonlinear medium. These variations are deduced through detection of the beam transmitted through a small, fixed aperture. After the seminal work by Sheik-Bahae et al. [30] in 19
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/10/2011
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9. Propriedades optoeletrônicas de interfaces híbridas metal/semicondutor orgânico preparadas por deposição assistida por feixe de íons (IBAD) / Optoelectronic properties of interfaces hybrid metal / organic semiconductor prepared by ion beam assisted deposition (IBAD)
In this work, optoelectronic properties from organic light emitting devices (OLEDs), based on conjugated polymers with metallic cathode, which were deposited by ion beam assisted deposition technique (IBAD) were studied. The main objective of this work is to produce a hybrid non abrupt metal/polymer interface and to study its effects on electron injection. T
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/07/2011
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10. Construção e caracterização de célula solar tipo barreira Schottky CdTe/Al / Construction and caracterization of Schottky barrier solar cells CdTe/Al
In this work the techniques of hot wall epitaxy (HWE) and molecular beam epitaxy (MBE) on thin films of CdTe (cadmium telluride) were used in order to manufacture a prototype solar cell type Schottky barrier. The films were produced by evaporation of a solid alloy of CdTe, varying two parameters of deposition: the growth time and substrate temperature. In th
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/05/2011
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11. Trapping state stabilization in a micromaser with a mixed atomic beam
A scheme which stabilizes the trapping states in micromasers is proposed and studied. It uses an atomic beam composed of a mixture of two types of atoms. Numerical simulations based on the Monte Carlo wavefunction method show that, despite collective events, it is possible to obtain a steady-state photon number distribution limited (‘‘trapped’’) to a
Publicado em: 2011
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12. Estabelecimento de um novo método de calibração de câmaras de ionização tipo lápis para dosimetria em feixes de tomografia computadorizada / Establishment of a new calibration method of pencil ionization chamber for dosimetry in computed tomography
Pencil ionization chambers are used for beam dosimetry in computed tomography equipment (CT). In this study, a new calibration methodology was established, in order to make the Calibration Laboratory of Instituto de Pesquisas Energéticas e Nucleares (LCI) suitable to international metrological standards, dealing with specific procedures for calibration of t
Publicado em: 2010